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%I #7 Oct 24 2019 16:01:27
%S 1,4,12,80,304,2176,8832,64768,271104,2013184,8579072,64200704,
%T 276815872,2082406400,9053405184,68364861440,299056168960,
%U 2264753766400,9954207989760,75553161871360,333336432082944,2534637351993344,11217239353065472,85421341058007040,379009013460762624
%N a(n) = A027144(2n, n).
%K nonn
%O 0,2
%A _Clark Kimberling_
%E More terms from _Sean A. Irvine_, Oct 24 2019
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